You want to remove the splash screen am I right?
When you boot and see GRUB, select Ubuntu and press E, now find and delete then press Ctrl+X, if this is the effect you want, then let's make it permanent.
Find this line
sudo nano /etc/default/grub
And turn it into
If it has anything else on the line, leave it as is and just remove "splash quiet". If you see this line
Do the same. Now press Ctrl+O, Enter and Ctrl+X. Now finally type thisNow every time you boot you won't see the splash screen.